public class ConstantDemo {
    public static void main(String[] args){
        System.out.println("abc");
        System.out.println("123");

        System.out.println('a');
        System.out.println('0');

        System.out.println(10);
        System.out.println(-10);

        System.out.println(1.2);
        System.out.println(-12.3);


        System.out.println(true);
        System.out.println(false);


    }

}
